\chapter*{Abstract}
\addcontentsline{toc}{chapter}{Abstract}

This thesis presents the design of a secure and privacy preserving
e-petition system using a Google Android phone as user platform.

The electronic petition system presented in this thesis comprises the following components:
 a user platform, also called host, in our case a mobile phone running the operating system
  Google Android. A secure element, a micro SD (Secure Device) card, which will
  provide cryptographic methods and keys needed for authentication. And two servers: a
   credential issuer and a petitions server. All of them implemented by the student.
    
    The system ensures that duplicate signatures are detectable, while
    preserving the anonymity of petition signers.

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